package String;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str="好好学习Java";
        StringBuilder builder=new StringBuilder(str);
        //增
        builder.append("，为了找个好工作");
        System.out.println(builder);
        //replace删
        builder.replace(9,16,"就是为了世界和平");
        System.out.println(builder);

        //delete():删除部分内容，含头不含尾
        builder.delete(0,8);
        System.out.println(builder);

        //insert():插入内容
        builder.insert(0,"死了");
        System.out.println(builder);








       /* //StringBuilder的创建方式：
        StringBuilder builder1=new StringBuilder();
        StringBuilder builder2=new StringBuilder("abc");

        //String和StringBuilder互相转换；
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);
        String str2=builder3.toString();

        */
    }
}
